1 /* arc4_lock.c - global lock for arc4random 2 * 3 * Copyright (c) 2014, NLnet Labs. All rights reserved. 4 * 5 * This software is open source. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * Redistributions of source code must retain the above copyright notice, 12 * this list of conditions and the following disclaimer. 13 * 14 * Redistributions in binary form must reproduce the above copyright notice, 15 * this list of conditions and the following disclaimer in the documentation 16 * and/or other materials provided with the distribution. 17 * 18 * Neither the name of the NLNET LABS nor the names of its contributors may 19 * be used to endorse or promote products derived from this software without 20 * specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 25 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 26 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 27 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 28 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 29 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 30 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 #include "config.h" 35 #define LOCKRET(func) func 36 #ifdef ENABLE_LOCK_CHECKS 37 #undef ENABLE_LOCK_CHECKS 38 #endif 39 #include "util/locks.h" 40 41 void _ARC4_LOCK(void); 42 void _ARC4_UNLOCK(void); 43 44 #ifdef THREADS_DISABLED 45 void _ARC4_LOCK(void) 46 { 47 } 48 49 void _ARC4_UNLOCK(void) 50 { 51 } 52 53 void _ARC4_LOCK_DESTROY(void) 54 { 55 } 56 #else /* !THREADS_DISABLED */ 57 58 static lock_quick_type arc4lock; 59 static int arc4lockinit = 0; 60 61 void _ARC4_LOCK(void) 62 { 63 if(!arc4lockinit) { 64 arc4lockinit = 1; 65 lock_quick_init(&arc4lock); 66 } 67 lock_quick_lock(&arc4lock); 68 } 69 70 void _ARC4_UNLOCK(void) 71 { 72 lock_quick_unlock(&arc4lock); 73 } 74 75 void _ARC4_LOCK_DESTROY(void) 76 { 77 if(arc4lockinit) { 78 arc4lockinit = 0; 79 lock_quick_destroy(&arc4lock); 80 } 81 } 82 #endif /* THREADS_DISABLED */ 83